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United States Patent | 5,057,069 |
Marion | October 15, 1991 |
A method and apparatus for folding a length of material includes forming first and second transverse folds at opposite ends of the material whereby the material defines first and second end parts and a central part. Longitudinal corrugations are formed in the first and second end parts in order to reduce a transverse dimension of the first and second end parts. A third transverse fold is formed in the central part in order to bring the first and second end parts into superposition. In the resulting folded material, edges of the first and second end parts are recessed inward from edges of the central part.
Inventors: | Marion; Louis (Vieux bourg de Gondamine, 42230 Saint Victor sur Loire, FR) |
Appl. No.: | 443703 |
Filed: | November 29, 1989 |
Dec 01, 1988[FR] | 88 16491 |
Current U.S. Class: | 493/395; 493/405; 493/426; 493/435; 493/445; 493/456; 493/463 |
Intern'l Class: | B31B 045/16; B31B 045/18; B31B 045/30 |
Field of Search: | 493/395,397,405,407,426,435,444,445,456,463 |
1501774 | Jul., 1924 | Heeter et al. | 493/444. |
1693147 | Nov., 1928 | King | 493/444. |
1980532 | Nov., 1934 | Kahn | 493/444. |
2954974 | Oct., 1960 | Kellett | 493/444. |
3901501 | Aug., 1975 | Kistner | 493/444. |
4083552 | Apr., 1978 | Sioman | 493/444. |
4487598 | Dec., 1984 | McDonald | 493/463. |
4569672 | Feb., 1986 | Marion et al. | 493/444. |
4601695 | Jul., 1986 | Pazzi | 493/418. |
4699031 | Oct., 1987 | D'Angelo et al. | 493/463. |
Foreign Patent Documents | |||
0056353 | Jul., 1982 | EP. | |
2564812 | Nov., 1985 | FR. |